finding mse and hence quantifying the quality of an image

i want a matlab code for finding mean square error and hence quantifying the quality of an image in digital image processing

Answer 1

[Wayne King]

The Wavelet Toolbox has a function for this measerr(), but it's easy enough to do. Suppose that X is your image and Xapp is the approximation

   X = randn(256,256);
   Xapp = randn(256,256);
   errim = (X-Xapp).^2;
   mse  = sum(errim(:))/numel(X);